Photoperiodism phenomena was first discovered by

Garnet and Allard

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Haberlandt

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Wickson and Thimann

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Osborne

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Solution

The correct option is A Garnet and Allard
Photoperiodism was first discovered by Garner and Allard in 1920. Photoperiodism is the phenomenon of physiological changes that occur in plants in response to relative length of day and night. The response of the plants to the photoperiod, expressed in the form of flowering is also called as photoperiodism.

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